Clarity

Hi All：

You can see a picture at the bottom.This is interface of Advanced_Reproting.There is a list on the left of the show panel that created by a single SQL in jaspersoft_studio.So I hope I can get the current user's name or object of current user.And how can I use it.

not really sure I understand question, but I think you are looking for the built-in Parameters for current user loggedin  and running report.

Built-in Parameters for Logged In User | Jaspersoft Community  

You will have to include them in your sql query for the inputcontrol